Fraxinus sieboldiana
Common name: 
Siebold Ash,
Japanese Flowering Ash,
Chinese Flowering Ash
Pronunciation: 
FRAK-si-nus see-BOL-de-i-ana
Family: 
Oleaceae
Genus: 
Type: 
Broadleaf
Native to (or naturalized in) Oregon: 
No
  • Deciduous tree, 20-30 ft (6-9 m) high, young branches thin with erect pubescence.   Leaves opposite, pinnate compound, to 20 cm, 5-7 leaflets, each leaflet 3.5 cm wide, abruptly acuminate, margin serrate or entire, glabrous, midrib downy.    Flowers white in "string-like" clusters to 15 cm, blooms in late spring/early summer.  Fruit wings oblanceolate, 2.5-3 cm long.
  • Sun.
  • Hardy to USDA Zone 6   Native to Japan and central China.
  • Fraxinus sieboldiana, along with F. ornus (Flowering Ash), F. bungeana, F. floribunda, F. griffithii, and F. paxima, have flowers with a corolla (i.e., the collection of petals).  The flowers of most Fraxinus do not have petals.
  • sieboldiana: after Philipp Franz von Siebold (1796-1866), German doctor who introduced and named many plants from Japan.
Click image to enlarge
  • plant habit

    plant habit

  • leaves

    leaves

  • flower clusters and leaves

    flower clusters and leaves

  • flower clusters

    flower clusters